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OpenAdvisories

Product · Spring

Reactor Core

2 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

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  • Medium 5.9
    CVE-2026-47863

    Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush

    In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.7.19 and earlier

    Spring Reactor Core
  • Medium 5.9
    CVE-2026-47857

    Reactor Core windowTimeout fair-backpressure stream hang due to 20-bit index wrap-around

    In Reactor Core, applications that use the Flux.windowTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.5.0 - 3.7.19 Reactor Core 3.4.41 and earlier

    Spring Reactor Core